Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
cau tren » dau tren, ca tren, cau treo
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
cu tren » tu tren, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. hieu van giao duc va hanh ve ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu van giao duc va hanh ve ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu van giao duc va hanh ve ((cau tren) or (cu tren))*.